Holster accidents: self-inflicted gunshot injuries of the knee and leg.

A man accidentally shot himself in the knee while holstering his own revolver. Although the pain was minimal, the wound "clean", and the joint flexible, angiography revealed a false aneurysm of the popliteal artery, a short segment of minimal tears below it, and a popliteal arteriovenus fistula slightly distal to the false aneurysm. Any penetrating wound of the popliteal fossa whose trajectory points to the vascular structures should be investigated angiographically.